It seems there was a slight interruption in our previous conversation. Let's complete the calculation for the mean mark and then proceed with the remaining parts of the question (e, f, g) using the fr

It seems there was a slight interruption in our previous conversation. Let's complete the calculation for the mean mark and then proceed with the remaining parts of the question (e, f, g) using the frequency distribution table we established.

Here is the complete frequency distribution table with $x=15$:

Marks (Class Interval)	Frequency (f)
10-19	10
20-29	15
30-39	15
40-49	27
50-59	18
60-69	10
70-7